tbh, my highest crafter when I started this was 45. and I've been able to hq all the stuff easily.

my 'rotation' is as follows: Inner Quiet, Steady Hand, Great Strides, Standard touch, (repeat those last two if not 100%) then standard synth (15 cp for 150%) 1 or 2 times to finish.

This has worked for me every time. Now that I have two 50's (weaver, ltw) I substitute Careful Synth 2 for standard snyth.